old journeys are not assigned to new performer

Summary:

Existing journeys are not assigning to new performer in the system

Content (please ensure you mask any confidential information):

I have recently changed the performer of the task from Person A to Person B by deleting the AOR from person A and assign the same AOR to Person B, but the existing tasks are not showing to Person B in the Journeys. How I can trigger the existing tasks to Person B to do the tasks.

Version (include the version you are using, if applicable):

25A

Code Snippet (add any code snippets that support your topic, if applicable):